In generally speaking There are natural and man-made causes of gravel causes, nature as sand and gravel, referring to a mixture of sand and loose gravel. Geologically, the particle size of 0.074 ~ 2mm mineral or rock particles called sand, gravel particles larger than 2mm or called breccia (The difference is that in varying degrees are rounded, detail visible entry conglomerates, sandstones ).

If the gravel in the gravel, mostly gravel, called grit stone. Everyday life was also known as the sandstone gravel.

Deposits of sand and gravel, the unconsolidated granular materials resulting from the natural

disintegration of rock or stone, are generally found in near-surface alluvial deposits and in subterranean and subaqueous beds. Sand and gravel are siliceous and calcareous products of the weathering of rocks and unconsolidated or poorly consolidated materials. Such deposits are common throughout the country. The six-digit Source Classification Code (SCC) for construction sand and gravel processing is 3-05-025, and the six-digit SCC for industrial sand and gravel is 3-05-027.

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